Hi guys, I have just designed and made a data logger shield for Arduino. It can be useful for putting up a full-featured data logger device based on Arduino, with convenient I/O extension, with massive storage and Bluetooth connectivity. The shield works with Arduino UNO/Duemilanove/Leonardo and more dedicatedly Compact MEGA 2560.

To perform wireless communication with mobile devices, all needed to do on Arduino side is serial communcation with SoftwareSerial. Please note that the maximum length of data sent at one time is up to 20 bytes.